11.   They work in deep pits filled with the black exhaust from their pumps, sluicing the sand across crude filters and using mercury to extract the gold dust.

12.   Gregory said rescuers were unfamiliar with the cave and were surprised the men attempted the deep pit to get inside it.

13.   The ashes are then buried in deep pits.

14.   The carcasses were being burned to ash and buried in deep pits to try to prevent the spread of contagion.

15.   To reduce the threat of contagion, the carcasses were being burned to ash and buried in deep pits.

16.   Controlled explosions in deep pits near to the village of Margotici in eastern Bosnia, where the cache was discovered, were carried out to destroy the munitions.